This is consistent with the pattern of many school shooters, and the theory that he was lashing out against a “system,” be it society, government, the educational system, or all three. This type of behavior actually transcends school shooters and fits into a broader category of mass murderers who commit terrorist acts. For example, I remember walking through the Oklahoma City Memorial and seeing the tiny shoes of the babies who lost their lives after Timothy McVeigh bombed the federal building. McVeigh did not view the babies as innocent individuals who he had a personal problem with but saw them as necessary casualties of war in his fight against the government. In this sense, the victims are actually symbolic representations of a much larger system that the aggressor is upset about.
Suggested Reading: Without Conscience: The Disturbing World of the Psychopaths Among Us